Rule 34 Dev - 0vv0b 1boy ass back_muscles back_turned back_view backsack balls blue_eyes blue_hair bottomless color dumbbell galo_thymos gym human human_only indoors looking_at_viewer male male_focus male_only muscle muscles muscular muscular_arms muscular_male pants_removed presenting presenting_ass presenting_butt promare rear_view solo solo_focus solo_male sparkle tank_top toned toned_male topwear treadmill winking|4291633896